Author(s): F. Gallerano; I. P. Rufin
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Keywords: No Keywords
Abstract: It is shown a numerical model for the simulation of the bottom evolution through analysis of wave field. of current structure and of erosion and sedimentation field. The wave field is simulated by Perlin and Dean refraction and diffraction model. The hydrodynamic field is simulated by solving the Navier-Stokes equations in which the divergence of the radiation stresses produced by obliquely incident sea waves is introduced. The erosion and deposision field is simulated by solving the diffusion and transport equation of the depth averaged concentration of sediment in which the source and sink terms related to the net flux of sediment from the bottom are introduced. Those terms are connected with the time variation of the bottom and are defined in relation with the difference between the "actual near to the bottom concentration" and the "near to the bottom concentration in equilibrium condition"; such values are calculated starting from the vertical distribution of suspended sediment produced by turbulence phenomena. got by the combined action of waves and currents.
Year: 1989